Aeroplane mounting



Sept. 27, 1938. E. LI DALE 2,131,222

AEROPLANE MOUNTING Filed May 10, 1957 INV/VT0R. 1.00 L. Dal/E.

KT'TOR/VEX Patented Sept. 27, 1938 UNITED STATES A 2,131,222 AEROPLANEMOUNTING Eldon L. Dale, Long Beach, Calif., assignor, by

direct and mesne assignments, to Dale Radioplane 00., a corporation ofCalifornia Application May 10, 1937, Serial No. 141,664

3 Claims.

This invention relates to an aeroplanemounting, particularly for toyaeroplanes and the prime object of my invention is to provide a mountingfor an aeroplane which is revolvable about a central tower and whichpermits the plane to loop while revolving about the central pivot, thelooping of the plane being accomplished by the pull of the propeller andthe lift of the wings and without other controls or power applied to themounting arm.

Still another object is to provide an aeroplane mounting of thecharacter stated, which is simple in construction, is efiective andrealistic in use and further, which is relatively inexpensive tomanufacture.

Other objects, advantages and features of invention may appear from theaccompanying drawing, the subjoined detailed the appended claims.

In the drawing:

Figure 1 is a side elevation of the aeroplane mounting with parts brokenaway to show interior construction.

Figure 2 is a top plan view of the same.

Figure 3 is a side elevation of the aeroplane mounting showing thedriving motor and mounting arm also in side elevation.

Figure 4 is a fragmentary planview of the pivotal mounting for the am. V

Figure 5 is a fragmentary plan 'view of the inner end of the mountingarm.-

Referring ,more particularly to the drawing, the numeral l indicates thecentral tower about which the toy aeroplane 2 revolves. The toyaeroplane includes the usual wings 3, and a driving propeller 4. Themethod of driving said propeller will be further described. A trunnion 5is journaled in the top of thetower I and a ring 6 is integrally formedwith the trunnion 5 and is positioned on the top thereof. A ball I ispivotally mounted in the ring 6 on the pintles 88. The ball I is thuspermitted to pivot in a vertical plane. An electric motor 9 is attachedto one side of the ball i by suitable means usual and well known in theart. A sleeve i0 is attached to the ball 1 and projects substantiallyhorizontally therefrom on the side opposite to which the motor 9 isattached. The motor 9 receives its power through wires ll showndiagrammatically in Figure 1. Sliding contacts I 2 on the trunnion 5convey the current to the motor 9 and also permit horizontal andvertical movement of the parts as will be further described. The speedof the motor is controlled from the rheostat l3, the rheostat beingplaced description and.

at a distance from the tower I. An arm I is journaled in the sleeve illat its inner end and the outer end of the same is curved in a horizontalplane as shown at l5, so as to enter the fuselage of the plane 2 asshown in Figure 2. The outer end of the arm is also bent downwardly in avertical plane as shown at IS. The curves l5-I6 permit the plane to loopas itrevolves about the trunnion 5 as will be evident from analyzing theforces exerted by the propeller 4. and the lift of the wings 3. It isnoted that there is a lever arm extending from the center line of thearm l4 indicated at C in Figure 1 and extending to the line A B inFigure 1. The propeller 4 exerts a force in the line A B and the lift ofthe wings 3 exerts a force at right angles to this line A B. This lastnamed force extends upwardly. The component of these two forces then, isa line extending upwardly at an angle to the line A B and consequentlythe plane will revolve around the point C, when the speed of thepropeller 4, i. e. the forward speed of the plane is sufliciently high.The lifting force of the wings and the forward force of the propeller 4are all exerted in a plane displaced horizontally from the point- C.This is evident from viewing Figure 2. The curve I5 accomplishes thispurpose and again there is a lever arm, the length of which is from thecenter line of the arm It to the plane of lift of the wings 3. Ifhisivill also tend to cause the plane to loop or revolve around the center'line of the arm M. The propeller 4 is driven from the motor 9 by aflexible wire H which extends through the arm l4 and is attached to thearmature of the motor. When'the propeller 4 is not revolving, theaeroplane would tend to hang close to the floor, with the propeller\ lpointing downwardly. To prevent this, I piovide a. i

stop for the arm It, so that when idle the aeroplane will assume aninclined position substantially as shown in Figure 1. This stop consistsof a'finger l8, which is attached to the ring 6. A notch i9 is providedin the side of the arm l4, which notch is engaged by the finger l8 whenthe aeroplane is not in flight. As soon as the propeller i is driven,the aeroplane will lift the arm l4 upwardly, thus disengaging the fingerl8 and permitting the arm M to revolve when the aeroplane is looping. Itwill be evident from the foregoing description, that the electric motor9 counterbalances the aeroplane 2 and further, that the center of themotor is directly in line with the arm I4, thus permitting the drivingcable or wire I! topass directly from the armature of the motor into thearm 14 and thence to the propeller 4. By regulating the speed of themotor from ing mounted for vertical movement, a driving motor on oneside of the trunnion, an aeroplane mounted on the outer end of the arm,apropeller on the aeroplane and, a flexible cable extending from themotor through the arm and thence to the propeller, whereby the propelleris driven by the motor and a remote rheostat controlling the speed ofsaid motor, said arm being curved in a horizontal plane as it enters theaeroplane and said aim being curved downwardly and in a vertical planeat the outer end thereof.

2. An aeroplane mounting comprising a central tower, a trunnionpivotally mounted in the tower, an arm journaled on the trunnion, saidarm being mounted for vertical movement, a driving motor on one side ofthe trunnion, an aeroplane mounted on the outer end of the arm, apropeller on the aeroplane and a flexible cable extending from the motorthrough the arm and thence to the propellerpwherebythe propeller isdriven by the motor and a remote rheostat controlling the speed of saidmotor, said arm being curved in'a horizontal plane as it enters theaeroplane and said arm being curved downwardly and in a vertical planeatf the outer end thereof, and disengageable means engaging the arm whenthe aeroplane is at rest, whereby said arm is prevented from rotating.

3. An aeroplane mounting comprising a cen tral' tower, a trunnionpivotally mounted in the tower, an arm journaled on the trunnion, saidarm being mounted for vertical movement, a driving motor on one-side ofthe trunnion, an aeroplane mounted on' the outer end of the arm, apropelleron theaeroplane and a flexible cable extending from the motorthrough the arm and 'thence'to the propeller, whereby the propeller isdriven by the motor and a remote rheostat controlling the speed of saidmotor, 'said arm being curved in a horizontal plane as it enters theaeroplane and said arm being curved downwardly and in a vertical planeat the outer end thereof,

a fixed finger adjacent the arm and means on the arm engageable by thefinger when the aeroplane is at rest, whereby said arm isprevented fromrotating,v

ELDON IL. DALE.

